Overview

We are building a new startup inside Factorial, aiming to scale from 0 to 10 million in under a year. The new spinoff focuses on rethinking how companies manage workflows, org charts, policies, and analytics—core operational facets of Factorial’s platform. As a Founding Engineer, you will join at day zero, working closely with a small, high‑energy team that values speed, decision‑making with incomplete data, and building products people actually use.

Key Responsibilities

- Lead the design, development, and delivery of AI‑powered features for the IT Management domain, including onboarding, permissions, support, and equipment management.
- Own the full lifecycle of features—from hypothesis, to build, to deployment, measurement, and iteration.
- Conduct customer calls to understand pain points and translate them into product requirements.
- Review and mentor code daily, providing constructive feedback to all team members, including juniors.
- Collaborate with the product team to set quarterly goals and roadmap, focusing on technical readiness and alignment with business objectives.
- Advise teammates on transitioning from deterministic to probabilistic AI models, ensuring outputs can be reasoned about and acted upon.
- Ensure scalable, cloud‑native integration of AI models with a Ruby on Rails backend and a React/TypeScript frontend.
- Get involved in architectural decisions concerning agentic workflows and LLM trade‑offs.
- Participate in recruiting, interview, and mentoring processes to grow the engineering team.

Qualifications

- 4+ years of software engineering experience, preferably with a track record of shipping AI features.
- Strong experience in Ruby on Rails and React or TypeScript.
- Proficiency in building and maintaining scalable backend services, integrating AI models, and ensuring reliability.
- Hands‑on understanding of LLM architecture, agentic workflows,



and probabilistic systems.
- Ability to explain complex technical concepts in clear English to non‑technical stakeholders.
- Entrepreneurial mindset, comfortable building from scratch, shipping quickly, and learning from data.
- Collaborative attitude, eager to mentor others and engage in peer reviews.
- Experience or strong curiosity about onboarding, permissions, or IT operations is a plus.

Working Model

- Office‑first model in Barcelona or Madrid: on‑site several days a week for collaboration and alignment.
- Remote work is supported when it benefits focus, personal needs, or change of scenery.
- Adaptable schedule balances deep work with team interaction.

Hiring Process

- Intro Call – discussion with Talent Partner about your journey and goals.
- Hiring Manager Interview – deep dive into product mindset, teamwork, and problem‑solving.
- Live Challenge – collaborative technical exercise based on real‑life problems.
- Final Coffee Chat – relaxed conversation with the CTO & VP of Engineering to explore vision, culture, and growth.
- All stages are conducted remotely via video conferencing tools.

Benefits

- Private health insurance through Alan.
- Wellness program with Wellhub (gyms, pools, outdoor classes).
- Subscription to language learning platforms.
- Breakfast and organic fruit in the office.
- Food discounts with Nora.
- Pet‑friendly workplace.
- Opportunities for growth in a fast‑moving, multicultural environment.

We welcome applicants from all backgrounds and advocate equal opportunities. We are committed to workplace inclusion of people with disabilities; please indicate any accommodation needs during the application process.

Company Commitment

Factorial is a leading AI‑powered business management platform with over 15,000 customers, 1,500 employees worldwide, and a focus on transparency, career progression, and inclusive culture.

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📌 Senior Product Engineer - Factorial IT (Barcelona)
🏢 Factorial Hr
📍 Barcelona